Malicious PDF — malware analysis report

Static analysis result for SHA-256 213fd0f091c1b913…

MALICIOUS

PDF

72.3 KB Created: 2021-03-31 04:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 61bd73b49de44a189702871caa8656ea SHA-1: f53fb1f122c1812ff6f2441e0b8a8fb17c1291df SHA-256: 213fd0f091c1b91300536b030155592146977b1965f77d267f1816adcb3f8368
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a high concentration of links pointing to disposable hosting and domains with unknown reputations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/123?utm_term=catecismo+breve+de+westminster+pdf PDF link annotation
    • http://gprofights.ru/cocina_prehispanica_arqueologia_mexicanah06ue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_6045e62e26140.pdfIn PDF document text
    • http://wovuwukotuvoxi.mygamesonline.org/xixabivijolosabodazofa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487005/normal_5febbb123c875.pdfIn PDF document text
    • http://badge-verification-center.com/leah_remini_troublemaker_canada7mo66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489588/normal_5febf6f00527f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469641/normal_60304593be854.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/fobefiwevoxoti.pdfIn PDF document text
    • http://bonboxstudio.com/what_kind_of_battery_does_a_2017_chevy_malibu_taker0w5b.pdfIn PDF document text
    • http://hellesypakk.online/debojusatr3xm9.pdfIn PDF document text
    • http://madawuboso.sportsontheweb.net/identidades_trigonometricas_pitagoricas_ejercicios_resueltos.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/between_a_rock_and_a_hard_place_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ef453b-7374-42f1-ba9c-9237d1ffeeee/troy-bilt_pony_battery_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f408dd-3147-4353-a3d1-40e3a12398b7/kingdom_manga_wiki.pdfIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_4bcfdf3ee16241dfba803007882da0e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b2c8dc-69fd-4353-809d-180cbb9f1a33/double_down_kfc_price_jamaica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab55682-5e85-4b5b-a8a5-355ea43d8b70/pupopowalitufizimix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c253fe6e-092e-4743-8710-e424d0a28b3b/badedawovumexiro.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/lotafakejavenujerizelinoj.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/92348154240.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/72153209020.pdfIn PDF document text
    • https://0b670cc3-d94b-4117-8b98-7ce677fb6c21.filesusr.com/ugd/7bc559_c335e4cb83eb4cdebff0d2e13072ad65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/getizar/92398641200.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_a5888487ce3c4e659771f7f74e69b8c6.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_47d0cfd217dc4d4f9ee0df2b56ae60a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/surjit_bhullar_songs_mr_jatt.pdfIn PDF document text
    • http://malejubu.myartsonline.com/alimentacion_en_embarazo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 5468 bytes
SHA-256: de465ff83d5e679d15a935f4fbf07bbef566f1effda5c3b963d8d9f053cb04ed
font_01_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 11980 bytes
SHA-256: f637b80e1e269c031fa99a9432d77626e50321174560ed3806910b217f8e065c